/*
    这是网易严选的 rem 适配文件
*/
;
(function (win) {
  var doc = win.document;
  var docEl = doc.documentElement;
  var metaEl = doc.querySelector('meta[name="viewport"]');

  var dpr = 0;
  var scale = 0;
  var tid;

  if (metaEl) {
    console.warn("将根据已有的meta标签来设置缩放比例");
    var match = metaEl.getAttribute("content").match(/initial\-scale=([\d\.]+)/);
    if (match) {
      scale = parseFloat(match[1]);
      dpr = parseInt(1 / scale)
    }
  }

  if (!dpr && !scale) {
    var isAndroid = win.navigator.appVersion.match(/android/gi);
    var isIPhone = win.navigator.appVersion.match(/iphone/gi);
    var devicePixelRatio = win.devicePixelRatio;
    if (isIPhone) {
      if (devicePixelRatio >= 3 && (!dpr || dpr >= 3)) {
        dpr = 3
      } else {
        if (devicePixelRatio >= 2 && (!dpr || dpr >= 2)) {
          dpr = 2
        } else {
          dpr = 1
        }
      }
    } else {
      dpr = 1
    }
    scale = 1 / dpr
  }
  docEl.setAttribute("data-dpr", dpr);
  if (!metaEl) {
    metaEl = doc.createElement("meta");
    metaEl.setAttribute("name", "viewport");
    if (!!win.webPageScalable) {
      metaEl.setAttribute("content", "initial-scale=" + scale + ", user-scalable=yes")
    } else {
      metaEl.setAttribute("content", "initial-scale=" + scale + ", maximum-scale=" + scale + ", minimum-scale=" + scale + ", user-scalable=no viewport-fit=cover")
    }
    if (docEl.firstElementChild) {
      docEl.firstElementChild.appendChild(metaEl)
    } else {
      var wrap = doc.createElement("div");
      wrap.appendChild(metaEl);
      doc.write(wrap.innerHTML)
    }
  }

  function refreshRem() {
    var width = docEl.getBoundingClientRect().width;
    var ua = navigator.userAgent.toLowerCase();
    if (!/ipad.*yanxuan/.test(ua)) {
      if (width / dpr > 750) {
        width = 750 * dpr
      }
    }
    var rem = width / 10;
    docEl.style.fontSize = rem + "px";
    flexible.rem = win.rem = rem
  }

  win.addEventListener("resize",
    function () {
      clearTimeout(tid);
      tid = setTimeout(refreshRem, 300)
    },
    false);
  win.addEventListener("pageshow",
    function (e) {
      if (e.persisted) {
        clearTimeout(tid);
        tid = setTimeout(refreshRem, 300)
      }
    },
    false);
  if (doc.readyState === "complete") {
    doc.body.style.fontSize = 12 * dpr + "px"
  } else {
    doc.addEventListener("DOMContentLoaded",
      function (e) {
        doc.body.style.fontSize = 12 * dpr + "px"
      },
      false)
  }
  refreshRem();

})(window);
